期刊
ASTROPHYSICAL JOURNAL
卷 759, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/0004-637X/759/2/80
关键词
dynamo; magnetohydrodynamics (MHD); methods: laboratory; turbulence
资金
- National Science Foundation
- NSF [AST 09-02004, PHY 08-21899]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [0902004] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1004269] Funding Source: National Science Foundation
For the first time, we have directly measured the transport of a vector magnetic field by isotropic turbulence in a high Reynolds number liquid metal flow. In analogy with direct measurements of the turbulent Reynolds stress (turbulent viscosity) that governs momentum transport, we have measured the turbulent electromotive force ( emf) by simultaneously measuring three components of velocity and magnetic fields, and computed the correlations that lead to mean-field current generation. Furthermore, we show that this turbulent emf tends to oppose and cancel out the local current, acting to increase the effective resistivity of the medium, i.e., it acts as an enhanced magnetic diffusivity. This has important implications for turbulent transport in astrophysical objects, particularly in dynamos and accretion disks.
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